Principles of Nuclear Magnetic Resonance

Nuclear magnetic resonance is mainly a process of splitting under an external magnetic field and jointly absorbing some radiation of a certain frequency. At the same time, not all atomic nuclei will produce magnetic force. Nuclear magnetic resonance mainly uses the magnetic field phenomenon of atomic nuclei. The phenomenon of nuclear magnetic resonance is mainly based on the common radiation instruments nowadays. The principles of nuclear magnetic resonance are often used to conduct some molecular research and clinical disease examination.

The study of molecular structure and dynamics by nuclear magnetic resonance is mainly used in clinical applications in daily life. It is also used in the examination of some physical phenomena. It is a widely used analytical method and is applied in physics, chemistry, biology and various other fields. It is mainly used in clinical testing.

Magnetic resonance is a physical process in which an atomic nucleus with a non-zero magnetic moment undergoes Zeiman splitting of its spin energy levels under the action of an external magnetic field and resonates to absorb radio frequency radiation of a certain frequency. Not all atomic nuclei can produce this phenomenon. Atomic nuclei can produce nuclear magnetic resonance because they have nuclear spin. The nuclear spin produces a magnetic moment, and when the nuclear magnetic moment is in a static external magnetic field, it produces a precessing nucleus and energy level splitting. Under the action of an alternating magnetic field, the spin nucleus absorbs electromagnetic waves of a specific frequency and transitions from a lower energy level to a higher energy level. This process is called nuclear magnetic resonance.

Nuclear Magnetic Resonance (NMR) is based on quantum magnetic physics properties at the atomic scale. Nuclei with an odd number of protons or neutrons have intrinsic properties: nuclear spin, spin angular momentum. Nuclear spin produces magnetic moment. The NMR method of observing atoms is to place the sample under a strong external magnetic field. Modern instruments usually use low-temperature superconducting magnets. The magnetic field of the nuclear spin itself is rearranged under an external magnetic field, and most of the nuclear spins will be in a low-energy state. We apply an additional electromagnetic field to interfere with the nuclear spin in the low-energy state to a high-energy state, and then when it returns to the equilibrium state, it will release radio frequency, which is the NMR signal. Using this process, we can conduct molecular science research, such as molecular structure, dynamics, etc.

The above is the principle of nuclear magnetic resonance. Nuclear magnetic resonance is currently the main instrument for diagnosing diseases, and is mainly used for molecular research. In order to avoid some forms of medical radiation, it mainly uses magnetic resonance imaging as a biological spin imaging technology to provide information, which is a more extensive diagnostic technique than some medical images.